US4862825A - Method and apparatus for stripping metal sheet coated with molten material - Google Patents
Method and apparatus for stripping metal sheet coated with molten material Download PDFInfo
- Publication number
- US4862825A US4862825A US07/096,554 US9655487A US4862825A US 4862825 A US4862825 A US 4862825A US 9655487 A US9655487 A US 9655487A US 4862825 A US4862825 A US 4862825A
- Authority
- US
- United States
- Prior art keywords
- sleeve
- gas
- bath
- set forth
- coating material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000002184 metal Substances 0.000 title claims abstract description 15
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title description 4
- 239000012768 molten material Substances 0.000 title description 2
- 239000000463 material Substances 0.000 claims abstract description 30
- 239000011248 coating agent Substances 0.000 claims abstract description 29
- 238000000576 coating method Methods 0.000 claims abstract description 29
- 238000009434 installation Methods 0.000 claims abstract description 9
- 229910018503 SF6 Inorganic materials 0.000 claims abstract description 8
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229960000909 sulfur hexafluoride Drugs 0.000 claims abstract description 8
- 238000005422 blasting Methods 0.000 claims description 5
- 230000003134 recirculating effect Effects 0.000 claims 1
- 238000005246 galvanizing Methods 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 28
- 239000000155 melt Substances 0.000 description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 101100372509 Mus musculus Vat1 gene Proteins 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
- C23C2/18—Removing excess of molten coatings from elongated material
- C23C2/20—Strips; Plates
Definitions
- the invention relates to a method of stripping metal sheets coated with molten material and in particular to stripping sheet or sheet material coated in a galvanising or vitreous-coating installation directly after the coated sheet has left a bath of molten coating material, both sides of the strip-like or web-like sheet being blasted with a thin curtain of gas.
- the invention relates to apparatus for carrying out this method with two opposed gas nozzles which are arranged near and above the bath from which the sheet is drawn, and which form a thin curtain of gas for blasting both sides of the strip-shaped sheet or sheet-like material passing between them.
- the object of the invention is to be able to carry out the coating of sheet metal coated in a galvanising or vitreous-coating installation and in particular of a sheet material of strip-like form passing continuously through such an installation, on the one hand without unwanted oxidation problems and on the other hand as economically as possible.
- the method of the kind outlined in the introduction is arranged so that the sheet or strip-like sheet material is blasted with an inert gas which is significantly heavier than air and is recirculated.
- the sheet metal is blasted with sulfur hexafluoride or a mixture containing it.
- the inert gas such as nitrogen which have been used hitherto for blasting coated sheet metal surface are only relatively slightly heavier than air and on the basis of their own density they do not separate, or separate only insufficiently, from air. Accordingly recovery of such gases is poor and also only possible to a limited extent. Also such gases cannot protect the surface of the molten coating material present in the bath of a galvanising or vitreous-coating installation sufficiently or completely enough against the action of atmospheric oxygen.
- a gas such as sulfur hexafluoride is about five times heavier than nitrogen and even more markedly heavier than air so that is separates itself thoroughly from air on the basis of its own density alone and accordingly it can be specifically sucked away and fed back for renewed use.
- this gas In the border zone between this gas and the air there are no zones in which a mixture between air and this gas is present and oxidation is possible.
- the relatively heavy sulfur hexafluoride does not rise upwards and accordingly for its recovery it is only necessary to ensure that it can fall into a defined zone or a defined space from where it can be conducted away and thereby recovered for renewed use.
- a further object of the invention is to provide apparatus for stripping surplus coating material from the surface of sheet metal in which the two blast nozzles arranged opposite one another over a bath of molten coating material are arranged in a box-like sleeve of which the side and end walls extend down at least to the level of the surface of the melt and which has in its upper face an opening for the continuously emerging sheet material.
- This box-shaped sleeve which can be regarded as a kind of housing and which has its side and end walls reaching down to the surface of the melt, forms with the melt a chamber from which the gas emerging from the blast nozzles cannot escape in an uncontrolled manner as long as care is taken that the gas is drawn off in sufficient quantity from the sleeve for its recovery.
- the gas which is blown in does not escape through the opening provided in the upper face of the sleeve for the emerging sheet material because it is heavier than oxygen and accordingly has the tendency to sink downwards. Only if the gas is not conducted away from the sleeve can it eventually emerge from the top opening.
- a pipe fitting is provided below the blast nozzles arranged in the sleeve, for carrying away the gases emerging from the blast nozzles.
- a suction pipe with a suction fan can be connected to this fitting.
- the sleeve is provided at its lower rim with buoyancy bodies or floats which make contact with the melt present in the bath and, so-to-speak, float on the melt. Accordingly variations in the level of the surface of the melt are automatically compensated.
- the sleeve is provided in its side and end walls with an expanding portion which can be in the form of bellows.
- an expanding portion which can be in the form of bellows.
- At least one direction-changing roller 4 is mounted immersed in the melt and the web of material 5 is conducted over it, this web being of sheet material and passing through the apparatus in the direction of an arrow 6 in a manner not explained further. Further guide elements for the web of material 5 are omitted in order to keep the drawing simple.
- vat 1 there are two mutually opposed blast nozzles 7 and 8 of a known kind, to which a blower 9 is connected through pipes 10 and 11 in order to feed under pressure to the nozzles 7 and 8 a gas which is heavier than air, for example sulfur hexafluoride.
- a gas which is heavier than air for example sulfur hexafluoride.
- This gas is blasted from mutually facing slot-shaped nozzle openings 12 and 13 so that it forms a substantially horizontal curtain through which the web 5 passes.
- this blast any surplus coating material picked up from the melt 2 in the vat 1 is stripped away from the surface of the web 5.
- the nozzles 7 and 8 are mounted in a box-shaped sleeve 14 of which the top wall 15 has a relatively wide slot-shaped opening 16 through which the web 5 can emerge.
- the gas or gas mixture which is resting on the surface of the metal melt and is heavier than air protects the melt against corrosion. Moreover, it is thermally insulating and offers some sound protection.
- a siphon i.e. a U-shaped or similarily formed tube bend can be filled at its lower portion with sulfur hexafluoride or a mixture containing it, which is heavier than air in order to keep apart two gases, a liquid and a gas or even a metal melt from the surrounding atmosphere.
- Carbon dioxide is for example suitable as a component for mixing with sulfur hexafluoride.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Claims (14)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3631893 | 1986-09-19 | ||
DE19863631893 DE3631893A1 (en) | 1986-09-19 | 1986-09-19 | METHOD AND DEVICE FOR STRIPING SHEET COATED WITH MELT LIQUID MATERIAL |
Publications (1)
Publication Number | Publication Date |
---|---|
US4862825A true US4862825A (en) | 1989-09-05 |
Family
ID=6309928
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/096,554 Expired - Lifetime US4862825A (en) | 1986-09-19 | 1987-09-14 | Method and apparatus for stripping metal sheet coated with molten material |
Country Status (8)
Country | Link |
---|---|
US (1) | US4862825A (en) |
EP (1) | EP0260533B1 (en) |
JP (1) | JPS6386854A (en) |
AT (1) | ATE73176T1 (en) |
AU (1) | AU600019B2 (en) |
DE (2) | DE3631893A1 (en) |
ES (1) | ES2030406T3 (en) |
GR (1) | GR3004037T3 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5491036A (en) * | 1992-03-27 | 1996-02-13 | The Louis Berkman Company | Coated strip |
US5597656A (en) * | 1993-04-05 | 1997-01-28 | The Louis Berkman Company | Coated metal strip |
US6080497A (en) * | 1992-03-27 | 2000-06-27 | The Louis Berkman Company | Corrosion-resistant coated copper metal and method for making the same |
US6652990B2 (en) | 1992-03-27 | 2003-11-25 | The Louis Berkman Company | Corrosion-resistant coated metal and method for making the same |
WO2004003250A1 (en) * | 2002-06-28 | 2004-01-08 | Sms Demag Aktiengesellschaft | Use of separation gas in continuous hot dip metal finishing |
US6794060B2 (en) | 1992-03-27 | 2004-09-21 | The Louis Berkman Company | Corrosion-resistant coated metal and method for making the same |
US20040214029A1 (en) * | 1992-03-27 | 2004-10-28 | The Louis Berkman Company, An Ohio Corporation | Corrosion-resistant coated copper and method for making the same |
BE1018124A3 (en) * | 2008-07-01 | 2010-05-04 | Ct Rech Metallurgiques Asbl | Metal products i.e. steel wires, coating method, involves coating metal products by molten metal using heavy gas at molecular weight greater than or equal to specific value, where gas does not decompose at temperatures below specific value |
US11357341B2 (en) * | 2019-02-26 | 2022-06-14 | Fasteners For Retail, Inc. | Retail merchandise display device with security shield |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4010801C2 (en) * | 1990-04-04 | 1998-07-23 | Unitas Sa | Device for stripping running tape material |
FR2857280A1 (en) * | 2003-07-08 | 2005-01-14 | Dominique Laurain | Tank for the uniform coating of components with a liquid coating material incorporating a system for the evacuation of surplus coating material, notably for zinc coating strip |
DE10333766B4 (en) * | 2003-07-23 | 2009-01-22 | Thyssenkrupp Steel Ag | Method and apparatus for hot dip coating of metal strip |
DE102004021214B4 (en) * | 2004-04-29 | 2007-11-22 | Air Liquide Gmbh | Method and device for inerting the environment of a running strip material after a dip treatment |
KR101222346B1 (en) | 2010-12-13 | 2013-01-14 | 동부제철 주식회사 | apparatus to produce galvanizing steel sheets |
CN109207897B (en) * | 2017-12-12 | 2020-06-16 | 朱正直 | Tinning equipment |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4296145A (en) * | 1978-12-30 | 1981-10-20 | Nippon Steel Corporation | Method for coating one side only of steel strip with molten coating metal |
US4330574A (en) * | 1979-04-16 | 1982-05-18 | Armco Inc. | Finishing method for conventional hot dip coating of a ferrous base metal strip with a molten coating metal |
US4612215A (en) * | 1983-04-13 | 1986-09-16 | Ziegler S.A. | Process and installation for the continuous application of an oxidizable coating to a strip |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE369436C (en) * | 1920-11-12 | 1923-02-19 | Childe Harold Wills | Circulation fan for hydrocarbon engines |
DE617024C (en) * | 1929-06-12 | 1935-08-10 | Karl Daeves Dr Ing | Process to prevent the formation of white rust on galvanized goods |
AU421751B2 (en) * | 1968-03-08 | 1972-02-25 | Australian Wire Industries Pty, Ltd | Improved method of and apparatus for wiping galvanised wire or strip |
US3842896A (en) * | 1973-06-04 | 1974-10-22 | Monsanto Co | Method for producing composite metal wire |
AU538925B2 (en) * | 1979-04-16 | 1984-09-06 | Ak Steel Corporation | Finishing of hop dip coating of ferrous base metal |
US4287238A (en) * | 1980-04-11 | 1981-09-01 | Bethlehem Steel Corporation | Protective atmosphere gas wiping apparatus and method of using |
JPS57198253A (en) * | 1981-05-29 | 1982-12-04 | Nippon Steel Corp | Continuous zinc hot dipping method |
-
1986
- 1986-09-19 DE DE19863631893 patent/DE3631893A1/en not_active Withdrawn
-
1987
- 1987-09-03 DE DE8787112839T patent/DE3777040D1/en not_active Expired - Lifetime
- 1987-09-03 EP EP87112839A patent/EP0260533B1/en not_active Expired - Lifetime
- 1987-09-03 AT AT87112839T patent/ATE73176T1/en not_active IP Right Cessation
- 1987-09-03 ES ES198787112839T patent/ES2030406T3/en not_active Expired - Lifetime
- 1987-09-08 AU AU78160/87A patent/AU600019B2/en not_active Ceased
- 1987-09-14 US US07/096,554 patent/US4862825A/en not_active Expired - Lifetime
- 1987-09-16 JP JP62233629A patent/JPS6386854A/en active Pending
-
1992
- 1992-03-11 GR GR920400430T patent/GR3004037T3/el unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4296145A (en) * | 1978-12-30 | 1981-10-20 | Nippon Steel Corporation | Method for coating one side only of steel strip with molten coating metal |
US4330574A (en) * | 1979-04-16 | 1982-05-18 | Armco Inc. | Finishing method for conventional hot dip coating of a ferrous base metal strip with a molten coating metal |
US4330574B1 (en) * | 1979-04-16 | 1988-05-31 | ||
US4612215A (en) * | 1983-04-13 | 1986-09-16 | Ziegler S.A. | Process and installation for the continuous application of an oxidizable coating to a strip |
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040213916A1 (en) * | 1992-03-27 | 2004-10-28 | The Louis Berkman Company, A Corporation Of Ohio | Corrosion-resistant fuel tank |
US5616424A (en) * | 1992-03-27 | 1997-04-01 | The Louis Berkman Company | Corrosion-resistant coated metal strip |
US6811891B2 (en) | 1992-03-27 | 2004-11-02 | The Louis Berkman Company | Corrosion-resistant coated metal and method for making the same |
US5667849A (en) * | 1992-03-27 | 1997-09-16 | The Louis Berkman Company | Method for coating a metal strip |
US5491036A (en) * | 1992-03-27 | 1996-02-13 | The Louis Berkman Company | Coated strip |
US6080497A (en) * | 1992-03-27 | 2000-06-27 | The Louis Berkman Company | Corrosion-resistant coated copper metal and method for making the same |
US6652990B2 (en) | 1992-03-27 | 2003-11-25 | The Louis Berkman Company | Corrosion-resistant coated metal and method for making the same |
US7575647B2 (en) | 1992-03-27 | 2009-08-18 | The Louis Berkman Co. | Corrosion-resistant fuel tank |
US6858322B2 (en) | 1992-03-27 | 2005-02-22 | The Louis Berkman Company | Corrosion-resistant fuel tank |
US20040214029A1 (en) * | 1992-03-27 | 2004-10-28 | The Louis Berkman Company, An Ohio Corporation | Corrosion-resistant coated copper and method for making the same |
US20070104975A1 (en) * | 1992-03-27 | 2007-05-10 | The Louis Berkman Company | Corrosion-resistant coated copper and method for making the same |
US20070023111A1 (en) * | 1992-03-27 | 2007-02-01 | The Louis Berkman Company, A Corporation Of Ohio | Corrosion-resistant fuel tank |
US6794060B2 (en) | 1992-03-27 | 2004-09-21 | The Louis Berkman Company | Corrosion-resistant coated metal and method for making the same |
US6861159B2 (en) | 1992-03-27 | 2005-03-01 | The Louis Berkman Company | Corrosion-resistant coated copper and method for making the same |
US7045221B2 (en) | 1992-03-27 | 2006-05-16 | The Louis Berkman Company | Corrosion-resistant coated copper and method for making the same |
US5597656A (en) * | 1993-04-05 | 1997-01-28 | The Louis Berkman Company | Coated metal strip |
US5695822A (en) * | 1993-04-05 | 1997-12-09 | The Louis Berkman Company | Method for coating a metal strip |
US20050233088A1 (en) * | 2002-06-28 | 2005-10-20 | Walter Trakowski | Use of separation gas in continuous hot dip metal finishing |
AU2003219109B2 (en) * | 2002-06-28 | 2009-01-22 | Sms Demag Aktiengesellschaft | Use of separation gas in continuous hot dip metal finishing |
WO2004003250A1 (en) * | 2002-06-28 | 2004-01-08 | Sms Demag Aktiengesellschaft | Use of separation gas in continuous hot dip metal finishing |
BE1018124A3 (en) * | 2008-07-01 | 2010-05-04 | Ct Rech Metallurgiques Asbl | Metal products i.e. steel wires, coating method, involves coating metal products by molten metal using heavy gas at molecular weight greater than or equal to specific value, where gas does not decompose at temperatures below specific value |
US11357341B2 (en) * | 2019-02-26 | 2022-06-14 | Fasteners For Retail, Inc. | Retail merchandise display device with security shield |
Also Published As
Publication number | Publication date |
---|---|
ES2030406T3 (en) | 1992-11-01 |
EP0260533A3 (en) | 1989-03-15 |
AU7816087A (en) | 1988-03-24 |
ATE73176T1 (en) | 1992-03-15 |
DE3777040D1 (en) | 1992-04-09 |
EP0260533B1 (en) | 1992-03-04 |
EP0260533A2 (en) | 1988-03-23 |
GR3004037T3 (en) | 1993-03-31 |
AU600019B2 (en) | 1990-08-02 |
JPS6386854A (en) | 1988-04-18 |
DE3631893A1 (en) | 1988-03-31 |
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Owner name: UNITAS S.A., ALLEE MARCONI 16 LUXEMBURG / LU. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:FONTAINE, PAUL P.;REEL/FRAME:004847/0887 Effective date: 19880204 Owner name: UNITAS S.A.,LUXEMBOURG Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FONTAINE, PAUL P.;REEL/FRAME:004847/0887 Effective date: 19880204 |
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